Process Equipment and Plant Design
Generally, elliptical dished heads

Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m²
Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter
Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D
All of these

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

It is used for high viscosity liquor having large rate of scaling
There is no central downtake
Downtake is formed by the annular space between the bundle and the shell
The tube bundle is suspended on bracket

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